Cab



FIG. 1 is a side elevation view of a cab showing my new design, the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a right side elevation view thereof. 

The ornamental design for a cab, as shown and described. 